Vítězslav – React, Node.js, Typescript

Various projects via his own company. Delivered short-to-mid-term B2B engagements for international clients in remote product teams. Specialized in MVPs, PoCs, deadline recovery, technical acceleration, and focused delivery.

• Worked on React/TypeScript architecture, Web3 integrations, Node.js APIs, refactoring, technical debt reduction, delivery tooling, documentation, and mentoring through code reviews and topic-driven learning sessions.
• Implemented Web3 integrations using web3.js, ethers.js, wagmi, and rainbowkit.
• Performed refactoring and TypeScript migrations.
• Optimized React.js applications.
• Produced documentation with JSDoc, Markdown, and Docusaurus.
• Set up and configured project tooling, including monorepo structure, webpack, and tsconfig.

An interactive frontend proof-of-concept application focused on a data table and charts for price analysis.

• Formed a two-developer team to rapidly deliver a pricing recommendation PoC that grew from a short MVP into a multi-phase product engagement after a successful client pitch.
• Implemented a responsive frontend for a pricing recommendation dashboard, translating analytical backend outputs into reviewable UI flows and charts for human administrators.
• Integrated the frontend with a Python backend through API contracts, handling loading, errors, and data states clearly in the UI.
• Implemented static export and coordinated packaging so the app could be served from the Python backend and bundled as a Windows/MacOS executable.
• Set up build and release automation through GitHub Actions to make delivery repeatable.
• Built a light/dark themed responsive interface and kept the component structure maintainable for follow-up iterations.

Backoffice dashboard and browser extension for the VPN product.

• Contributed to both a browser extension and a backoffice dashboard in a production VPN environment.
• Led the reimplementation of a dashboard feature aligned with a new design system while keeping compatibility with the existing production codebase.
• Extended and refactored existing frontend functionality with a focus on safe changes, maintainability, and reduced regression risk.
• Designed and implemented cross-browser rate limiting for free-tier users in the VPN browser extension, enforcing server-switching cooldown rules consistently.
• Synchronized state across browser contexts so cooldown and abuse-prevention rules worked across tabs, background logic, and UI surfaces.
• Investigated technical debt across two repositories and produced a plan for gradual reduction without blocking delivery.
• Contributed to code quality through review, consistency improvements, and clearer boundaries between UI, state, and integrations.

Real-time drone control dashboard with map overview and mission planning tool.

• Joined a small senior fullstack team to finalize an MVP under deadline pressure for client demonstrations and investor pitch.
• Built parts of a highly reactive real-time web application for controlling multiple drones during live car racing events.
• Implemented telemetry overview, live camera feeds, mission planning, route visualization, perimeter control, and historical path tracking.
• Integrated WebRTC video streams, WebSocket/gRPC telemetry, and map-based mission data into a unified tablet-oriented operator interface.
• Built manual flight-control and mission-execution workflows with attention to low-latency updates and operational clarity.
• Optimized reactive UI state handling in Preact to keep live telemetry and mission data responsive.

Natively multi-chain bridging and minting platform for NFT creators and collectors.

• Joined as one of the initial full-stack engineers and helped establish frontend architecture, GraphQL API endpoints, delivery structure (incl. Docker), and CI/CD foundations.
• Assumed ownership of the Frontend and Documentation domains after team growth and migration to a monorepo setup.
• Developed responsive web applications for NFT dashboard, mint, and bridge products across multiple redesigns, themes, and mobile layouts.
• Lead Web3 integrations and later migrated from web3-react toward wagmi/viem for better maintainability and developer experience.
• Reduced technical debt through refactoring, TypeScript integration, code review, and clearer component/API boundaries.
• Contributed a custom Solidity faucet contract and occasionally maintained NestJS GraphQL API areas.
• Maintained and refactored Docusaurus documentation using Markdown MDX, improving structure and long-term maintainability.
• Mentored peers through code reviews and knowledge-sharing sessions focused on technical issues, better patterns, codebase quality, and introducing emerging technologies.
• Explored product-facing R&D such as Farcaster Frames using Redis/Vercel KV.

A trade-up/upselling feature to display on a product page that offered customers similar products that are better in some aspect.

• Worked closely with UK-based Product Owners as a primary technical contact for product and delivery decisions.
• Led the design and implementation of a data-driven trade-up/upselling feature that compared similar products using weighted criteria and price-performance ranking.
• Implemented backend scoring logic and frontend integration, improving how users discovered better or cheaper alternatives aligned with purchase intent, resulting in increased conversion rates.
• Delivered microservices and backend-for-frontend APIs within a microfrontend/microservice architecture.
• Contributed to Currys e-commerce frontend features, internal backoffice systems, CMS tooling, and a custom WYSIWYG block editor using custom JSX Pragma (preprocessor).